CBSE Class 11 Biology Digestion And Absorption Worksheet

Question. The initial step in the digestion of milk in humans is carried out by
(a) lipase
(b) trypsin
(c) rennin
(d) pepsin. 
Answer: C

Question. A healthy person eats the following diet-5 gm raw sugar, 4 gm albumin, 10 gm pure buffalo ghee adultrated with 2 gm vegetable ghee (hydrogenated vegetable oil) and 5 gm lignin. How many calories he is likely to get?
(a) 126
(b) 164
(c) 112
(d) 144
Answer: D

Question. Which enzymes are likely to act on the baked potatoes eaten by a man, starting from the mouth and as it moves down the alimentary canal?
(a) Pancreatic amylase → Salivary amylase → Lipases
(b) Disaccharidase like maltase → Lipases → Nucleases
(c) Salivary amylase → Pancreatic amylase → Disaccharidases
(d) Salivary maltase → Carboxypeptidase → Trypsinogen 
Answer: C

Question. If for some reason our goblet cells are nonfunctional, this will adversely affect
(a) production of somatostatin
(b) secretion of sebum from the sebaceous glands
(c) maturation of sperms
(d) smooth movement of food down the intestine.
Answer: D

Question. If for some reason the parietal cells of the gut epithelium become partially non-functional, what is likely to happen?
(a) The pancreatic enzymes and specially the trypsin and lipase will not work efficiently.
(b) The pH of stomach will fall abruptly.
(c) Steapsin will be more effective.
(d) Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones.
Answer: D

Question. Which one of the following pairs of food components in humans reaches the stomach totally undigested ?
(a) Starch and fat
(b) Fat and cellulose
(c) Starch and cellulose
(d) Protein and starch
Answer: B

Question. What will happen if the secretion of parietal cells of gastric glands is blocked with an inhibitor?
(a) In the absence of HCl secretion, inactive pepsinogen is not converted into the active enzyme pepsin.
(b) Enterokinase will not be released from the duodenal mucosa and so trypsinogen is not converted to trypsin.
(c) Gastric juice will be deficient in chymosin.
(d) Gastric juice will be deficient in pepsinogen.
Answer: A

Question. Hydrolytic enzymes which act on low pH are called as
(a) proteases
 (b) α-amylases
(c) hydrolases
(d) peroxidases. 
Answer: A

Question. In mammals milk is digested by the action of
(a) rennin
(b) amylase
(c) intestinal bacteria
(d) invertase. 
Answer: A

Question. A person who is eating boiled potato, his food contains the component
(a) cellulose which is digested by cellulase
(b) starch which is digested
(c) lactose which is not digested
(d) DNA which can be digested by pancreatic DNase. 
Answer: B

Question. If pancreas is removed, the compound which remain undigested is
(a) proteins
(b) carbohydrates
(c) fats
(d) all of these. 
Answer: D

Question. What is common among amylase, rennin and trypsin?
(a) These are produced in stomach.
(b) These act at a pH lower than 7.
(c) These all are proteins.
(d) These all are proteolytic enzymes. 
Answer: C

Question. Choose the correct enzyme - substrate pair.
(a) Carbohydrate - Lipase
(b) Maltase - Lactose
(c) Rennin - Casein
(d) Protein - Amylase 
Answer: C

Question. Which of the following is the function of enterogastrone?
(a) It inhibits the secretion of gastric juice.
(b) It stimulates the secretion of digestive juices in the stomach.
(c) It stimulates the flow of pancreatic juice.
(d) It regulates the flow of bile. 
Answer: A

Question. Which of the following is correct pairing of site of action and substrate of rennin?
(a) Mouth - Starch
(b) Small intestine - Protein
(c) Stomach - Casein
(d) Stomach - Fat 
Answer: C

Question. Most of the fat digestion occurs in
(a) rectum
(b) stomach
(c) duodenum
(d) small intestine. 
Answer: D

Question. Secretion of gastric juice is stopped by
(a) gastrin
(b) pancreozymin
(c) cholecystokinin
(d) enterogastrone.
Answer: D

Question. Our stomach is –
(a) U – shaped
(b) J – shaped
(c) C – shaped
(d) Rod – shaped
Answer. B

Question. Cardiac sphincter is –
(a) Gastro-oesophageal sphincter
(b) Gastro-duodenal sphincter
(c) Pyloric sphincter
(d) None
Answer. A

Question. Ileum is –
(a) First part of small intestine
(b) Middle part of small intestine
(c) Last part of small intestine
(d) First part of large intestine
Answer. C

Question. Caecum opens into –
(a) Rectum
(b) Duodenum
(c) Colon
(d) Jejunum
Answer. C

Question. The wall of alimentary canal from oesophagus to rectum posses four layers. The sequence of three layers is –
(a) Serosa → Mucosa → Submucosa → Muscularis
(b) Muscularis → Serosa → Mucosa → Submucosa
(c) Serosa → Muscularis → Mucosa → Submucosa
(d) Serosa → Muscularis → Submucosa → Mucosa
Answer. D

Question. Epiglottis is a cartilaginous flap which prevents the entry of food into –
(a) Glottis
(b) Gullet
(c) Oesophagus
(d) None of the above
Answer. A

Question. Mucosa forms irregular folds (rugae) in the –
(a) Ileum
(b) Stomach
(c) Jejunum
(d) Colon
Answer. B

Question. Essentially the word ‘digestion” means –
(a) Burning of food
(b) Hydrolysis of food
(c) Breaking down of food
(d) Oxidation of food
Answer. B

Question. Which of the following statements about starch digestion is false?
(a) It beings in mouth
(b) It occurs in stomach
(c) It requires the action of pancreatic amylase
(d) Its digestion is complete into small intestine
Answer. B

Question. Stomach is the site of digestion mainly of –
(a) Protein
(b) Lipid
(c) Starch
(d) Nucleic acid
Answer. A

Question. The stomach stores food for –
(a) 4 – 5 hours
(b) 1 hour
(c) 6 – 7 hour
(d) 30 m
Answer. A

Question. Lacteals take part –
(a) Digestion of milk
(b) Absorption of fat/ fatty acids and glycerol
(c) Digestion of lactic acid
(d) None of the above
Answer. B

Question. The intestinal mucosal epithelium has goblet cells which secretes –
(a) Digestive enzymes
(b) Intestinal digestive enzymes
(c) Mucus
(d) Succus intericus
Answer. C

Question. Absorption of digested food is carried out by –
(a) Passive method
(b) Active transport
(c) Facilitated transport
(d) All
Answer. D

Question. The tongue is attached to the floor or oral cavity by
(a) Papillae
(b) Frenulum
(c) Uvula
(d) Gullet
Answer. B

Question. An analysis of a patient’s diet shows they ate 90g carbohydrate, 10g protein, and 10g fat each day.Approximately how many Calories did this patient consume in one day?
(a) 440
(b) 470
(c) 490
(d) 740
Answer. C

Question. One gram of fat produces
(a) 4.1 k. calories of chemical energy
(b) 9.45 k. calories of chemical energy
(c) 7.0 k. calories of chemical energy
(d) 5.0 k. calories of chemical energy
Answer. B

Question. The alimentary canal in humans has length of
(a) 6- 9 meters
(b) 2 – 5 meters
(c) 10 – 28 meters
(d) 1 – 2 meters
Answer. A

Question. Enamel is composed principally of
(a) Ca phosphate
(b) Ca sulphate
(c) Ca chloride
(d) Na phosphate
Answer. A

Question. A healthy person eats the following diet – 5 gm raw sugar, 4 gm albumin, 10gm pure buffalo ghee adultrated with 2 gm vegetable ghee (hydrogenate vegetable oil) , 5 gm lignin. How many calories he is likely to get?
(a) 126
(b) 164
(c) 112
(d) 144
Answer. D

Question. A baby boy aged two years is admitted to play school and passes through a dental check –up. The dentist observed that the boy had twenty teeth. Which teeth were absent?
(a) Canines
(b) Pre-molars
(c) Molars
(d) Incisors
Answer. B

1. Define digestion.

2. Why do you refer to human teeth as:
a) Thecodont
b) Heterodont
c) Diphyodont

3. Give the dental formula of
a) Human adult
b) Human milk teeth

4. Draw a neat labeled diagram showing the anatomy of wall layers of alimentary canal. Also mention the names of different layers.

5. Name the salivary glands.

6. What are villi? Write their function.

7. Draw neat labeled diagrams of the following:
a) Section of small intestinal mucosa showing villi.
b) The duct systems of liver, gall bladder and pancreas.

8. Pancreas is known as heterogenous gland. Give reason.

9. Differentiate between ‘bolus’ and ‘chyme’.

10. Bile does not contain any enzyme. Still it is important for digestion. Justify.

11. Describe the process of starch digestion in the alimentary canal.

12. Harsh took bread and butter for his breakfast. Explain the course of digestion of butter in his digestive system. Also mention the enzymes involved.

13. Make a table showing different enzymes involved in protein digestion, their site of secretion and function

14. List the functions of large intestine.

15. Briefly describe two disorders associated with digestive system.